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ADS1240: ADC for IVC102

Danilo A.
Mastermind 28680 points
Part Number: ADS1240
Other Parts Discussed in Thread: IVC102, , ADS122C04

Hi Team,

Our customer is using IVC102 transimpedance amplifier for their product and would like to ask what ADC we could recommend to connect to it. Currently he is using LTC2485 but would like to confirm if the ADS1240 is a better fit? It seems that he needs an ADC with dual supply voltage to be able to convert the signal from IVC102. Can you please confirm? 

Regards,

Danilo

  • 0
    TI__Guru 52296 points

    Hi Danilo,

    I would recommend the ADS122C04 to the customer if they want a 24-bit ADC with I2C interface. If they can use an SPI interface then we have many more options.

    You might also reach out to the precision amplifier team to see if the can recommend an updated TIA instead of the IVC102. I know we have newer devices that would likely be better to use in this application.

    It is not clear what limitations the TIA would place on the ADC inputs. Do you know how the customer intends to use this device? What will be the range of output voltages they expect? This will depend on the output current from the sensor as well as the component values they choose.

    -Bryan

  • 0 in reply to Bryan Lizon86
    TI__Mastermind 28680 points

    Hi Bryan,

    According to our customer,

    Currently we poll the LTC2485 every 200 ms. the measured values range from -0.026591V up to 2.5V when we max out the IVC102 and LTC2485.

    Currently we are attempting to measure light levels that generate 25uV from the IVC102.

    Regards,

    Danilo

  • 0 in reply to Danilo A.
    TI__Mastermind 45715 points

    Hi Danilo,

    Bryan will respond your post when he is back in the office on 1/3.

    Best regards,

    Dale

  • 0 in reply to Dale Li
    TI__Guru 52296 points

    Hi Danilo,

    The ADS122C04 is still the best option then. The ADS122C04 has the same input range requirements with the PGA = 1 as the LTC2485 (GND-0.3V and AVDD+0.3V) so if the system worked with the LTC2485 it should work with the ADS122C04 as well.

    Have you looked into an alternative to the IVC102 from the precision amplifier team?

    Let me know if you need anything else for this application.

    -Bryan